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参数资料
型号： EVAL-418-LR
厂商： Linx Technologies Inc
文件页数： 10/16页
文件大小： 0K
描述： KIT BASIC EVAL 418MHZ LR SERIES
标准包装： 1
系列： LR
类型： 发射器，接收器
频率： 418MHz
适用于相关产品： LR 系列 RF 模块 - 418MHz
已供物品： 2 个板，2 个发射器，2 个接收器，2 根天线，电池，文档
Range Testing
Several complex mathematical models exist for determining path loss in
many environments. These models vary as the transmitter and receiver are
moved from indoor operation to outdoor operation. Although these models
can provide an estimation of range performance in the field, the most
reliable method is to simply perform range tests using the transmitter and
receiver in the intended operational environment.
Simple range testing can be performed with the transmitter and receiver
evaluation boards. To prepare the board for range testing, simply turn it
on by switching the power switch to the ON position. Pressing S0 on the
transmitter will activate the buzzer on the receiver board, while S1 activates
the LED. Switches SW0 and SW1 have been provided to jumper the
buttons and continuously transmit. This will allow the designer to turn on
the transmitter and walk with the receiver.
As you near the maximum range of the link in your area, it is not
uncommon for the signal to cut in and out as you move. This is normal
and can result from other interfering sources or fluctuating signal levels due
to multipath effects. This results in cancellation of the transmitted signal
as direct and reflected signals arrive at the receiver at differing times and
phases. The areas in which this occurs are commonly called “nulls” and
simply walking a little farther will usually restore the signal.
Since the evaluation boards are intended for use by design engineers,
they are not FCC certified. The transmitter has been set to approximate
legal limits by resistor R9 so that the range test results will approximate the
results from a well-designed, certified product. For applications where Part
15 limits are not applicable or output levels can be legally raised due to
protocol duty cycle, R9 can be changed according to the graph on Page 3
of the LR Series Transmitter Data Guide.
To achieve maximum range, keep objects such as your hand away from
the antenna and ensure that the antenna on the transmitter has a clear and
unobstructed line-of-sight path to the receiver board. Range performance
is determined by many interdependent factors. If the range you are able to
achieve is significantly less than specified by Linx for the products you are
testing, then there is likely a problem with either the board or the ambient
RF environment in which the board is operating. First, check the battery,
– 6 –
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相关代理商/技术参数
参数描述
EVAL-418-LT 功能描述:射频开发工具 LT Basic Eval System 418MHz (NEW) RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
EVAL-433-DS 功能描述:射频开发工具 DS Series Basic Eval Kit 433MHz RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
EVAL-433-HHCP 功能描述:射频开发工具 Compact HandHeld Eval Sys 433MHz RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
EVAL-433-HHLR 功能描述:射频开发工具 Long Range HandHeld Eval Sys 433MHz RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
EVAL-433-HHTX 功能描述:射频开发工具 HandHeld Eval System 433MHz, HHTX Series RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
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